How to Disabled OWA Signatures in Office 365 for all Staff.

This is normally done if a 3rd Party email branding software like exclaimer or CodeTwo is being used.

Native to Office 365 (Exchange Online) there is a great way to prevent users from Enabling Signatures in OWA : Disable OWA Signatures.

First lets create a connection to Office 365 Powershell.

$UserCredential = Get-Credential

Next lets create a new PSSession

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection

After Creating the new PSSession lets import it

The shell will look as follow after the import

Now that we have a connection to #MSOffice365 , lets go ahead and run a script to view all

Users with OWA email signatures.

get-mailbox -resultsize unlimited | get-mailboxmessageconfiguration |

where-object {$_.AutoAddSignature -Match “True”} | select-object AutoAddSignature,MailboxOwnerId

Results after running the first script

Now that we have a list of all users we can then run the second script to remove all “AutoAddSignature” for all Mailbox’s

Get-Mailbox -ResultSize Unlimited | Set-MailboxMessageConfiguration -AutoAddSignature $false

| Select-Object Name,AutoAddSignature

Hope you enjoyed the read !

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